import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int a = scanner.nextInt();
        scanner.close();

        int day;
        for (day = 1; a > 1; day++) {
            a = a / 2;
        }

        System.out.println(day);
    }
}
